... ,silicon,fluorine,rubber,PTFE 2.surface glass:organic,tempering,PVC,double explosion-proof glass - Structure:normal type,stainless steel type(anti-shock),electric point ... humidity no more than 85%- Movement:copper alloy,304SS, toughened glass and etc.- Nominal diameter:φ60,φ100,φ150,φ200,φ250- Working ...